Teaching machine



FIG. 1 is a front perspective view of the teaching machine showing our design;

FIG. 2 is a front elevational view of the teaching machine;

FIG. 3 is a rear elevational view of the teaching machine;

FIG. 4 is a right-side elevational view of the teaching machine;

FIG. 5 is a left-side elevational view of the teaching machine; and

FIG. 6 is a top plan view of the teaching machine. 

The ornamental design for a teaching machine, substantially as shown and described. 